Remove obsolete ignore patterns and categorize metafacture-fix patter…

…ns. (#577)

.gitignore

@@ -14,16 +14,15 @@
 # limitations under the License.
 #
 
-# Ignore temporary maven files:
-target/
-
 # Ignore temporary gradle files:
-.gradle/
-.gradletasknamecache
+/.gradle/
 build/
 
-# Ignore tmp directory
-tmp
+# Ignore temporary files:
+*.jfr
+generated/
+tmp/
+xtext-gen/
 
 # Ignore Eclipse project files:
 .checkstyle
@@ -38,30 +37,25 @@ tmp
 *.iws
 *.iml
 .idea
-/out/
-/*/out/
+out/
 
-# Ignore IntelliJ JIRA plugin
+# Ignore IntelliJ JIRA plugin:
 atlassian-ide-plugin.xml
 
-# Ignore files generated by CI:
-buildbot.keyring
-
-# Ignore VS code/codium config files
+# Ignore VS code/codium config files:
+*.vsix
 .vscode
 
-# Ignore files with sensitive data
+# Ignore files with sensitive data:
 gradle.properties
 secring.gpg
 
-# Ignore metafacture-fix files
-*.jfr
-*.vsix
-generated/
+# Ignore metafix-vsc files:
 node_modules/
 package-lock.json
-xtext-gen/
 xtext-server/
+
+# Ignore metafix integration test files:
 /metafix/src/test/resources/org/metafacture/metafix/integration/**/*.diff
 /metafix/src/test/resources/org/metafacture/metafix/integration/**/*.err
 /metafix/src/test/resources/org/metafacture/metafix/integration/**/*.out